nltk/nltk — pull request #206 by heatherleaf (2012-02-03 22:36:57+00:00)
Title: Cleanup, new regression tests and properties in tree.py

Here are some mostly minor modifications to tree.py and tree.doctest

- some new regression tests in tree.doctest
- properties and classmethods in @decorator style
- general cleanup in the code to make it more readable